soc: fsl: qbman: Use raw spinlock for cgr_lock

Summary

In the Linux kernel, the following vulnerability has been resolved: soc: fsl: qbman: Use raw spinlock for cgr_lock smp_call_function always runs its callback in hard IRQ context, even on PREEMPT_RT, where spinlocks can sleep. So we need to use a raw spinlock for cgr_lock to ensure we aren't waiting on a sleeping task. Although this bug has existed for a while, it was not apparent until commit ef2a8d5478b9 ("net: dpaa: Adjust queue depth on rate change") which invokes smp_call_function_single via qman_update_cgr_safe every time a link goes up or down.

Timeline

1. May 17, 2024, 1:23 PM UTCCVE published
2. Jun 17, 2024, 5:39 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. May 23, 2026, 3:43 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 4.9.92 · fixed in 4.10; From 4.14.32 · fixed in 4.15; From 4.15.15 · fixed in 4.16

• Linux Linux

  4.16

References 9